Imperial College London

ProfessorDavidEwins

Faculty of EngineeringDepartment of Mechanical Engineering

Distinguished Research Fellow
 
 
 
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Contact

 

+44 (0)20 7594 7067d.ewins

 
 
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Assistant

 

Ms Nina Hancock +44 (0)20 7594 7068

 
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Location

 

475City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

261 results found

Ewins DJ, 2017, A smart structural dynamics strategy for testing tomorrow's structures, Tribute Conference Honoring Daniel Inman, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X

Conference paper

Ewins DJ, Weekes B, Carri AD, 2015, Modal testing for model validation of structures with discrete nonlinearities, PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol: 373, ISSN: 1364-503X

Journal article

Giuliani P, Di Maio D, Schwingshackl CW, Martarelli M, Ewins DJet al., 2013, Six degrees of freedom measurement with continuous scanning laser doppler vibrometer, MECHANICAL SYSTEMS AND SIGNAL PROCESSING, Vol: 38, Pages: 367-383, ISSN: 0888-3270

Journal article

Zucca S, Di Maio D, Ewins DJ, 2012, Measuring the performance of underplatform dampers for turbine blades by rotating laser Doppler Vibrometer, MECHANICAL SYSTEMS AND SIGNAL PROCESSING, Vol: 32, Pages: 269-281, ISSN: 0888-3270

Journal article

Chan Y-J, Ewins DJ, 2012, Prediction of Vibration Response Levels of Mistuned Integral Bladed Disks (Blisks): Robustness Studies, JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME, Vol: 134, ISSN: 0889-504X

Journal article

Schwingshackl CW, Petrov EP, Ewins DJ, 2012, Measured and estimated friction interface parameters in a nonlinear dynamic analysis, Mechanical Systems and Signal Processing, Vol: 28, Pages: 574-584, ISSN: 0888-3270

The modelling of nonlinear friction contact interfaces in structural dynamics currently attracts large research interest since the accurate characteristics of the friction interfaces are required in the nonlinear dynamic analysis of assembled structures. For an accurate representation of friction contact interfaces it is important to ensure that a sufficient number of parameters are provided to characterise all aspects of the friction contacts that the measured values are accurate and reliable, and that the contact parameters are interpreted and used correctly in the numerical modelling of the contact interfaces. This investigation focused on three major parameters used in the nonlinear friction contact analysis: (i) the friction coefficient, (ii) the tangential contact stiffness, and (iii) the normal load distribution in the contact. The accuracy of the measured friction input parameters is evaluated and possibilities to obtain reliable normal load distributions for a successful prediction of the measured frequency response function are investigated. Average friction input parameters, based on a large set of experimental data, are introduced, and their effect on the nonlinear resonance response is discussed.

Journal article

Schwingshackl CW, Petrov EP, Ewins DJ, 2012, Effects of Contact Interface Parameters on Vibration of Turbine Bladed Disks With Underplatform Dampers, JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME, Vol: 134, ISSN: 0742-4795

Journal article

Schwingshackl CW, Massei L, Zang C, Ewins DJet al., 2012, A constant scanning LDV technique for cylindrical structures: Simulation and measurement, Mechanical Systems and Signal Processing, Vol: 24, Pages: 394-405, ISSN: 0888-3270

The reliance of the aerospace industry on finite element models during the design of new products requires the best possible models for the prediction of the dynamic behaviour and so it is usually necessary to validate an original model using some additional reference data as the basis - usually data measured on a test structure. Finite element model updating can lead to the required accuracy, and while attempts are under way to minimise the required experimental testing involved in the process, measurements still are an integral part of the procedure. To improve the validation process, a major aim of current experimental research is to provide a more complete set of data from a single experiment in a shorter amount of time, so as to increase the overall efficiency of the updating routine. To this end, a new continuously-scanning laser Doppler vibrometery measurement technique is presented for application to cylindrical structures. It allows the measurement of the dynamic behaviour of a cylindrical structure with a previously-unachievable spatial resolution in a much shorter time than conventional measurement methods. The introduced method is evaluated through a detailed simulation in order to investigate its robustness and to ensure data quality, and the results from a proof-of-concept test rig are presented.

Journal article

Schwingshackl CW, Petrov EP, Ewins DJ, 2012, EFFECTS OF CONTACT INTERFACE PARAMETERS ON VIBRATION OF TURBINE BLADED DISKS WITH UNDERPLATFORM DAMPERS, ASME Turbo Expo 2011, Publisher: AMER SOC MECHANICAL ENGINEERS, Pages: 867-876

Conference paper

Di Maio D, Ewins DJ, 2011, Continuous Scan, a method for performing modal testing using meaningful measurement parameters; Part I, MECHANICAL SYSTEMS AND SIGNAL PROCESSING, Vol: 25, Pages: 3027-3042, ISSN: 0888-3270

Journal article

Chan Y-J, Ewins DJ, 2011, The Amplification of Vibration Response Levels of Mistuned Bladed Disks: Its Consequences and Its Distribution in Specific Situations, JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME, Vol: 133, ISSN: 0742-4795

Journal article

Carrella A, Ewins DJ, 2011, Identifying and quantifying structural nonlinearities in engineering applications from measured frequency response functions, MECHANICAL SYSTEMS AND SIGNAL PROCESSING, Vol: 25, Pages: 1011-1027, ISSN: 0888-3270

Journal article

Chan Y-J, Ewins DJ, 2011, The application of robust design strategies on managing the uncertainty and variability issues of the blade mistuning vibration problem, IUTAM Symposium on the Vibration Analysis of Structures with Uncertainties, Publisher: SPRINGER, Pages: 443-+

Conference paper

Ewins DJ, Chan YJ, 2011, Vibration of Rotating Bladed Discs: Mistuning, Coriolis, and Robust Design, IUTAM Symposium on Emerging Trends in Rotor Dynamics, Publisher: SPRINGER, Pages: 163-+

Conference paper

Chan Y-J, Ewins DJ, 2010, Management of the variability of vibration response levels in mistuned bladed discs using robust design concepts. Part 1 Parameter design, MECHANICAL SYSTEMS AND SIGNAL PROCESSING, Vol: 24, Pages: 2777-2791, ISSN: 0888-3270

Journal article

Chan Y-J, Ewins DJ, 2010, Management of the variability of vibration response levels in mistuned bladed discs using robust design concepts. Part 2 Tolerance design, MECHANICAL SYSTEMS AND SIGNAL PROCESSING, Vol: 24, Pages: 2792-2806, ISSN: 0888-3270

Journal article

Di Maio D, Ewins DJ, 2010, Applications of continuous tracking SLDV measurement methods to axially symmetric rotating structures using different excitation methods, MECHANICAL SYSTEMS AND SIGNAL PROCESSING, Vol: 24, Pages: 3013-3036, ISSN: 0888-3270

Journal article

Chan Y-J, Ewins DJ, 2010, A Comprehensive Procedure to Estimate the Probability of Extreme Vibration Levels Due to Mistuning, JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME, Vol: 132, ISSN: 0742-4795

Journal article

Ewins DJ, 2010, Control of vibration and resonance in aero engines and rotating machinery - An overview, INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING, Vol: 87, Pages: 504-510, ISSN: 0308-0161

Journal article

Fioretti A, Di Maio D, Ewins DJ, Castellini P, Tomasini EPet al., 2010, Deflection Shape Reconstructions of a Rotating Five-blade Helicopter Rotor from TLDV Measurements, 9th International Conference on Vibration Measurements by Laser and Noncontact Techniques and Short Course, Publisher: AMER INST PHYSICS, Pages: 17-+, ISSN: 0094-243X

Conference paper

Schwingshackl CW, Petrov EP, Ewins DJ, 2010, VALIDATION OF TEST RIG MEASUREMENTS AND PREDICTION TOOLS FOR FRICTION INTERFACE MODELLING, ASME Turbo Expo 2010, Publisher: AMER SOC MECHANICAL ENGINEERS, Pages: 1015-1024

Conference paper

Di Battista S, Di Maio D, Ewins DJ, Castellini P, Tomasini EPet al., 2010, Development of a Comprehensive Mathematical Model for Simulating the Effects of Misalignments in Vibration Measurements using Scanning LDV Measurement Systems, 9th International Conference on Vibration Measurements by Laser and Noncontact Techniques and Short Course, Publisher: AMER INST PHYSICS, Pages: 29-+, ISSN: 0094-243X

Conference paper

Carrella A, Friswell MI, Zotov A, Ewins DJ, Tichonov Aet al., 2009, Using nonlinear springs to reduce the whirling of a rotating shaft, MECHANICAL SYSTEMS AND SIGNAL PROCESSING, Vol: 23, Pages: 2228-2235, ISSN: 0888-3270

Journal article

Chan Y-J, Ewins DJ, 2009, A COMPREHENSIVE SET OF PROCEDURES TO ESTIMATE THE PROBABILITY OF EXTREME VIBRATION LEVELS DUE TO MISTUNING, 54th ASME Turbo Expo 2009, Publisher: AMER SOC MECHANICAL ENGINEERS, Pages: 211-219

Conference paper

Sever IA, Petrov EP, Ewins DJ, 2008, Experimental and numerical investigation of rotating bladed disk forced response using underplatform friction dampers, JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME, Vol: 130, ISSN: 0742-4795

Journal article

Nikolic M, Petrov EP, Ewins DJ, 2008, Robust strategies for forced response reduction of bladed disks based on large mistuning concept, 52nd ASME Turbo Expo 2007, Publisher: ASME, ISSN: 0742-4795

Conference paper

Nikolic M, Petrov EP, Ewins DJ, 2008, Robust strategies for forced response reduction of bladed disks based on large mistuning concept - art. no. 022501, 52nd ASME Turbo Expo 2007, Pages: 22501-22501

In this paper robust maximum forced response reduction strategies based on a "large mistuning" concept are introduced, including both (i) random and (ii) deterministic approaches. An industrial bladed fan disk serves as an application example for a reliability assessment of the aforementioned strategies using two well-established tools for uncertainty analysis: (i) statistics and (ii) sensitivity and robustness. The feasibility and other practical aspects of implementing large mistuning as a means of preventing excessive forced response levels caused by random mistuning and ensuring the predictability of the response are discussed.

Conference paper

Di Maio D, Ewins DJ, 2008, Measurement of out-of-plane vibrations of a rotating bladed disk using Blade Tip Timing measurement method, 8th International Conference on Vibration Measurements by Laser Techniques, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X

Conference paper

Zang C, Schwingshackl C, Ewins DJ, 2008, Error localization in an FE model in model updating process using supermodels, International Conference on Noise and Vibration Engineering, Publisher: KATHOLIEKE UNIV LEUVEN, DEPT WERKTUIGKUNDE, Pages: 1923-1936

Conference paper

Schwingshackl CW, Zang C, Massei L, Ewins DJet al., 2008, The Simulation of a Full-field Vibration Measurement of Cylindrical Structures Using a Continuous Scanning LDV Technique, 8th International Conference on Vibration Measurements by Laser Techniques, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X

Conference paper

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